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As Democrats and Republicans haggle over the details of financial reform in the Senate, a new tax law is quietly approaching that will force all overseas banks to reveal the overseas holdings of American account holders.

"I don't think a lot of people have paid attention to this," said Scott D. Michel, president of Caplin & Drysdale law firm.

"The whole purpose of this is to put American account holders around the world in a position where they can have no safe haven in any bank that wants to offer U.S. investments to any of its clientele," he added.

American citizens are required to report all of their worldwide income every year when filing their tax returns. As a part of that process, they are also required to disclose any offshore bank accounts they may have.

If an individual falsifies his or her tax claim by concealing their income in offshore accounts, banking secrecy laws in countries like Switzerland have in the past helped to keep that income hidden by making it a crime for the banks and their employees to disclose information about clients.

U.S. lawmakers designed the Foreign Account Tax Compliance Act (FATCA) to "force foreign financial institutions, foreign trusts, and foreign corporations to provide information" on undisclosed assets held by Americans after Dec. 31, 2012. If they fail to do so, the Internal Revenue Service (IRS) can hit the banks with 30% withholding on all income originating from the U.S.

The full details of FATCA have yet to be ironed out between the U.S. Treasury and the IRS, but one of its requirements will include a document for new account holders to sign that waives whatever rights they may have under local banking secrecy laws.

The U.S. estimates that it will raise an additional $8.5 billion in tax revenue over the next 10 years by forcing Americans to disclose income they are hiding from tax collectors.

Spurred by rising fiscal deficits, the United States and other members of the Organization for Economic Cooperation and Development (OECD), particularly Germany and France, have been using a variety of methods to clamp down on tax cheats, tax havens and overseas financial centers.

The most high profile of these were the UBS AG case and the OECD's attempt to name and shame those countries that fail to comply with internationally agreed standards.

Tax havens are usually characterized by extremely low tax rates, strong banking secrecy laws and flexible regulations in terms of licensing, incorporation and supervision. So-called shell companies, trusts and other legal entities are often used to shield assets from overseas authorities.

The OECD had initially singled out 47 jurisdictions that included the likes of Hong Kong, Macau, the Philippines and Malaysia, but hasty commitments to improve transparency along with some backroom deal-making led to all four being removed from the blacklist.

The U.S. tax authorities, however, have recently introduced another far more effective means of collecting information on tax evaders: They pay informers for it.

The IRS Whistleblower Office can pay anywhere between 15% and 30% of the taxes, penalties and interest collected for cases valued at $2 million or more.

The IRS has yet to make any payments under the new scheme, but that hasn't dissuaded people like Bradley C. Birkenfeld from trying. Formerly an employee of Switzerland’s largest bank UBS, Birkenfeld was sentenced to 40 months in jail for helping billionaire California real estate developer Igor M. Olenicoff hide $200 million offshore. Motivated in part by the possibility of a reward, Birkenfeld provided evidence to U.S. tax authorities detailing how the secretive Swiss bank helped wealthy Americans hide money offshore.

As a result, UBS was forced to admit wrongdoing, pay a fine of $780 million and to turn over data on as many as 4,450 UBS accounts to the Swiss government, which, pending Parliamentary approval, will pass the information to the U.S.

A number of banks from some of Europe's best-known tax havens are facing similar investigations. Germany launched over 1,000 tax evasion probes against clients of Credit Suisse last month. In December the French authorities said that it had the details of 24,000 Swiss bank accounts provided by a former HSBC employee.

Fearing the possibility of heavy fines and prosecution, many tax evaders from the U.S., Germany and France have come forward to report their assets.

Michel believes the disclosure of banking secrets will continue to grow. "When you combine the whistleblower regime with the template that the [U.S.] government used in the UBS case, with the information they're getting with all these voluntary disclosure cases and now FATCA, I think the era of bank secrecy is rapidly eroding in front of our eyes," he said.

The opinions expressed do not constitute investment advice and specialist advice should be sought about your specific circumstances.